| 1 | Be prepared for aftershocks. | |
| 2 | This was why the quakes were felt so broadly, and why there have been such frequent aftershocks. | |
| 3 | Japan has been shaken by more than 400 strong aftershocks since the earthquake and tsunami hit a month ago. | |
| 4 | "With an event like this, aftershocks can continue for years - maybe decades," says Sevilgen. | |
| 5 | My uncle told me aftershocks are occurring every half hour and that his legs are shaking all the time, even in the safe periods. |